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The last 10 posts

Thanks Mike. The system could have drains. As I dug around in the mud, I seemed I could almost touch where the leak was just outside the box. And it felt like there was some sort of plastic object there rather than just pipe heading for the next zone valve. I wouldn't think they would put a drain right next to the valve box because it has kept the valve box full of water and mud. (Maybe that is a normal place to put one?) I am not planning to dig up the ground this fall unless I get past a bunch of other chores. I'll let you know what I find.

Done!

Thanks for the support!

Blew the 7 zones out today through the backflow preventer testcock. Worked fine. My compressor is just big enough to maintain around 55 to 60#.

During the process, I found that there were good-sized air bubbles coming up through water that was in the 4-valve box. I figure that means water has been leaking from a connection in there 24/7, perhaps for months. And the pressure to all the zones must have been lower than normal. The leak is underground just outside the box. I'll have to dig it up in the Spring. hmm..... I hope I shouldn't be concerned that water from rain/snow will accumulate in the box, leak back into the pipe, freeze and crack it (??)

update

I used a metal detector and found a zone valve in a 6" cylindrical box. 2 missing valves to go. I was actually looking for a buried port to use for blow out. No luck there.

I bought two brass fittings and a 2' piece of 1/4" copper tubing to connect them together. One is a 1/4" female flare to 1/4" compression. And the other is a 1/4" female NPT to 1/4" compression. that seemed to be the best I could do. I am sure there is a less complicated way to connect the backflow preventer test cock to an pneumatic fitting. But I couldn't find it at Lowes or Home Depot.

Sure seems like the passageway through all of that stuff will restrict the airflow. I am hoping the copper doesn't melt.

I'll look for a 1/4" female flare adapter today at Lowes. I think the threads look pretty good and the top flared surface looks smooth.

I can't find any other blow out point. But her sod is in really good shape and it could have easily grown over a smaller access box - especially the 6" round type. I found one box that contains 4 valves and I had to cut away a lot of sod to get the lid off. Since there are seven zones, there are 3 valves that I haven't found, so I expect a blow out point could be hidden as well. I have confirmed that the person who used to blow out the system used the testcock port.

I've been considering feeding an audio or radio frequency signal into the wires at the control panel. Then, perhaps, I will be able to trace the signal to find the valves. But it would seem that won't help to find a blow out point.

I agree that the backflow preventer is in bad shape and should have been taken care of.

That looks like a mess waiting to happen! I would first scour the area for a seperate blow out point. Only after I was 120% convinced I had to connect to a test cock, would I attempt it. I would first submit a bid to move the RPZ to a more reasonable location.

If those testcocks are the only place you can connect your air, then you need to get a 1/4-inch "female flare" adapter to get to a pipe thread. Don't do anything to the testcocks, unless no other option exists (and they do exist) - those flare-end testcocks are to connect to the hoses of a backfow tester.